"Nyctalopia /\u02CCn\u026Akt\u0259l\u02C8o\u028Api\u0259/ (from Greek \u03BD\u03CD\u03BA\u03C4-, nykt- \"night\"; \u03B1\u03BB\u03B1\u03CC\u03C2, alaos \"blind, not seeing\", and \u1F44\u03C8, ops \"eye\"), also called night-blindness, is a condition making it difficult or impossible to see in relatively low light. It is a symptom of several eye diseases. Night blindness may exist from birth, or be caused by injury or malnutrition (for example, a lack of vitamin A)."@en . . "H53.6" . "368.6" . . . "Nyctalopia"@en .